User Guide

The earpiece and headset signals are multiplexed so that the outputs cannot be used simultaneously.
Figure 78 System connector
Table 17 System connector pin assignments
Pin #/ Signal
name
Signal
description
Spectral range Voltage/
Current levels
Max or
nominal serial
impedance
Notes
1/ Charge V Charge DC 0-9V/ 0.85A
2/ GND Charge GND - 0.85A 100mΩ (PWB+
conn.)
3/ ACI ACI 1kbits/s Digital 0 / 47Ω Insertion &
removal
detection
2.5-2.78V
4/ Vout DC out DC 2.78V 70 mA 100mΩ (PWB+
conn.)
200mW
2.5V 90mA
9 / XMIC N Audio in 300-8k 1Vpp &
2.5-2.78VDC
10 / XMIC P Audio in 300-8k 1Vpp &
2.5-2.78VDC
11 / HEAR N Audio out 20-20k 1Vpp 22Ω
12 / HEAR P Audio out 20-20k 1Vpp 22Ω
13 / HEAR R N Audio out 20-20k 1Vpp 22Ω Not conn. in
mono
14 / HEAR R P Audio out 20-20k 1Vpp 22Ω Not conn. in
mono
ACI interface electrical characteristics
Description Parameter Min Typ Max Unit Notes
Accessory detection
RM-170; RM-171
System Module Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 9 –27
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